She isnt a sahm.
You may consider he pre relationship assets as joint. She may do. But they are, currently his assets and (if he even meant a pre nup) he may not. What you or I think of the assets, they are legally his.
Again who knows, he may have always been clear from the outset, that they will always be seperate. And OP was happy with that until now.
And what I meant is, the only driving force for the marriage was his assets.
Would you marry someone, even if you have been together a longtime if you suspected it was only for money
Again, my point is there is limited information and only one point of view. So lots of information missing. There could be situations where its perfectly reasonable to have a prenup. And forbhee to want one.
Again, I am suggesting alternatives to 'this man us a cunt screwing her over and a prenup will be bad for her'
There could be there are other things happening. And it could be good for her to sign.
If she refuses and it causes issues and the marriage is short. She wont get a cut of his pension, pre marriage for example.
It might be better for her to ensure all assets accumulated since they have been together are included. In case of short marriage.